| 摘要 |
<p>1451237 Cleaning teeth STANDARD OIL CO 28 Sept 1973 [3 Oct 1972] 45437/73 Heading A5R [Also in Division C4] Dental floss comprises a yarn or filamentary material coated with a matrix of a natural or synthetic resilient wax or of polyethylene, polyethylene glycol, chlorosulphonated polyethylene; a polybutene-based rubber, an isoprene based rubber, a copolymer of butadiene and isoprene, styrene or acrylonitrile, polyvinyl or polyvinylidene chloride, a polyester or polyether-based elastomer, a silicone rubber or a polyurethane, or a mixture of these, and, as polishing agent, an oxide, silicate, carbide, boride, carbonate, phosphate, sulphide, or nitride of calcium, magnesium, silicon, aluminium, iron, titanium, zinc, tungsten, zirconium, tin, sodium or potassium or a mixture of two or more of these. The polishing agent may be present in a ratio of 1:5 to 5:1 compared with the matrix. The yarn may be of cotton, silk, linen, nylon, polyester or acrylic fibres. The matrix may be applied to the yarn or filament by passing through a bath of the polymer solution, and then through a die or wire coater. The polishing agent may then be applied by passing the still wet filament through a solid or fluid bed of the particles, lengths of the floss may be left uncoated at regular intervals. Alternatively the particles may be mixed with the matrix material before application to the filament.</p> |
